Update flog threshold
Replace rvmrc configuration with ruby-gemset
Add spec for mutable enumerator
Change Axiom::Equalizer to use Adamantium::Flat

* This should cause the object to be frozen, but it will not freeze
  any of it's dependencies.
* Refactor integration spec
Update flay threshold
Merge pull request #29 from dkubb/adamantium-flat

Change Axiom::Relation to use Adamantium::Flat
Upgrade gem dependencies